/Engine/Source/Runtime/AudioMixerCore/Public/AudioMixer.h
Gets the buffer data ptrs. Returns aTArrayViewfor the full buffer size requested, but in the case of an underrun, OutBytesPopped will be less that the size of the returnedTArrayView.
[TArrayView](API\Runtime\Core\Containers\TArrayView)< const uint8 > PopBufferData ( int32 & OutBytesPopped ) const